﻿// This file is part of YamlDotNet - A .NET library for YAML.
// Copyright (c) Antoine Aubry and contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

using System;
using System.Collections.Concurrent;

namespace YamlDotNet.Helpers
{
    internal static class DictionaryExtensions
    {
#if NETSTANDARD || NETFRAMEWORK
        public static bool TryAdd<T, V>(this System.Collections.Generic.Dictionary<T, V> dictionary, T key, V value)
        {
            if (dictionary.ContainsKey(key))
            {
                return false;
            }

            dictionary.Add(key, value);
            return true;
        }
#endif

#if NETSTANDARD || NETFRAMEWORK
        public static TValue GetOrAdd<TKey, TValue, TArg>(this ConcurrentDictionary<TKey, TValue> dictionary, TKey key, Func<TKey, TArg, TValue> valueFactory, TArg arg)
        {
            if (dictionary == null) { throw new ArgumentNullException(nameof(dictionary)); }
            if (key == null) { throw new ArgumentNullException(nameof(key)); }
            if (valueFactory == null) { throw new ArgumentNullException(nameof(valueFactory)); }

            while (true)
            {
                if (dictionary.TryGetValue(key, out var value))
                {
                    return value;
                }

                value = valueFactory(key, arg);
                if (dictionary.TryAdd(key, value))
                {
                    return value;
                }
            }
        }
#endif
    }
}
